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There's a parasite linked to wolves who are 46 times more likely to lead a pack. It's tied to risky behavior generally. In humans, toxoplasma gondii is associated with less conscientiousness and generosity. In women, it's tied to increased tribalism and less cultural liberalism. Oh, and it's also been linked to greater attractiveness.

https://www.iflscience.com/a-strange-parasite-massively-improves-a-wolf-s-chances-of-leading-the-pack-66368
https://www.iflscience.com/your-political-views-could-be-the-result-of-a-parasitic-infection-65636
https://www.iflscience.com/people-infected-by-brainaltering-cat-parasite-are-more-attractive-finds-study-63735